Drawing mechanism for spinning machines



Jan. 15, 1963 w. sTAHLEcKER ET AL 3,072,974

DRAWING MECHANISM FOR SPINNING MACHINES Filed Sept. 2l, 1959 2 Sheets-Sheet 1 [-IT 12 2 l 12' 1 12 Y 1\ 7.0 i q 3 `.4 5 9E 37 11 15 57ML 14 1N VEN TORS WILHELM ugh/7132K I HIM/5 S50/Lm? Amr/vers Jan. l5, 1963 w. STAHLECKER ET AL 3,072,974

DRAWING MECHANISM FOR SPINNING MACHINES Filed Sept. 2l, 1959 2 Sheets-Sheet 2 NINA, f.

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United States Patent() Y 3,072,974 DRAWING MECHANISM FOR SPINNING MACHINES Wilhelm Stahlecker, Ross-Steige .28, Tieringen, .near Balin* gen, Wurttemberg, and Hans Stahlecker, Haldenstrasse 20, Suessen, Wurttemberg, Germany Filed Sept. 21, 1959, Ser. No. 841,061 Claims priority, application Germany Sept. 23, 1958 11 Claims. (Cl. 19-281) The present invention relates to a drawing mechanism for spinning machines in which the loading means for the top rollers are slidably adjustable on an arm extending above the drawing mechanism.

The drawing mechanisms of vsome of the spinning machines known prior to this invention were already provided with upwardly pivotable arms for carrying the supporting brackets of the pressure rollers which, in turn, were equipped with means for loading the same. These loading means of the known drawing mechanisms were disposed above the shafts of the pressure rollers so as to be either vertically above the same or to act upon intermediate arms. Since the load acting upon the individual pressure roller was supported at a point above the center of gravity of the roller, the position of equilibrium of the forces was very unsteady and it was therefore necessary to provide the loading device with special securing means. This also made the pivotable arm of such a height that it became impossible to employ cleaning rollers which span more than two spindle positions which are of great importance for the proper operation of each drawing 'mechanism.

rail 1 on which 'the supporting brackets 2, 2' of the top or pressure rollers are kmounted so as to be adjustableby screws 12' in the longitudinal direction of rail 1. These brackets 2, 2 which may be made of sheet steel, cast iron or plastic contain compression or loading springs 3 and 4 and load-transmitting yokes 5, 5. Each bracket 2, 2 is provided with guide slots 7 in which a shaft `6 'of a ltop roller is mounted. Yokes 5, 5 may extend downwardly to the drawing plane extending between the top and bottom rollers. Loading springs 3 and 4 may be supported, for example, by spring caps 8 and 9 and projections 10 i and 11. As shown, for example, on yoke S in FIGURE It is an object of the present invention to provide a drawing mechanism lwhich overcomes the above-mentioned deiiciencies. For this purpose the invention pro vides the loading means for the top or pressure rollers in the form of springs which are disposed laterally of the i shaft of the pressure roller and either in front of or behind the same or at both points. This manner of arranging the loading means permits Ythe pivotable arm to be made of such a low height that it is possible to provide cleaning rollers which span many spindle positions although the cleaning rollers abut the top rolls since the arm, being of low height, will lie beneath the shaft of the cleaning rollers. A further advantage of the arrangement according to the present invention is that the load acting upon the pressure rollers is in a stable equilibrium with the opposing forces so that very little, if any, friction occurs at the supporting brackets of the pressure rollers.

These and additional objects and advantages of the present invention will become further apparent from the following detailed description of several preferred embodi ments thereof, particularly when the same is read with reference to the accompanying drawings, in which:

FIGURE l shows, partly in cross section, a side view of a drawing mechanism according to one embodiment of the invention;

FIGURE 2 shows a cross section taken along line II--II of FIGURE l;

FIGURE 3 shows a perspective view of a top-roller guide bracket according to FIGURE l;

FIGURE 4 shows, partly in cross section, a side view of a drawing mechanism according to a modiiication of the invention;

FIGURE 5 shows a cross section taken along line V--V of FIGURE 4; while FIGURE 6 shows, partly in cross section, a side view of a drawing mechanism according to a further modification of the invention employing draw springs.

Referring to the drawings, FIGURES l to 3 illustrate the drawing mechanism according to the invention in which the top-roller supporting arm consists of a U-shaped l, the spring caps 8 and 9 may, however, be omitted if guiding projections vfor the springs are impressed into the yoke. As illustrated in FIGURE 3, the two arms of each supporting bracket 2 'are provided withstop surfaces 201 with which laterally projecting tabs 52 on yoke 5 are vadapted to engage to determine the lowest position ofthe yoke. If made of a suitable shape, the yoke may also serve as a retainer of the top roller to prevent the latter from dropping out of slots 7 when rail 1 is pivoted up wardly. As shown only on the front bracket 2 at the left side of FIGURE 1, this may be attained, for example, by making yoke 5 of resilient material and by snapping lthe same over shaft 6 of the top roller so that the distance between the two inner yoke arms 51 below shaft 6 will be reduced. Although the loading springs are preferably provided in the form of coil springs 3 and 4, they may 'also 4be of any other suitable type, for example, cup

springs. v

The covering member 12 which covers rail 1 and has a central, upwardly arched portion may be drawn forwardly, as indicated vin FIGURE 1 in dotted lines, and serves in this position as an extended lever to permit the entire arm to be pivoted more easilyrinto the loading position yor to unload the pressure rollers. When shifted inwardly, this member 12 covers the setscrews 12 on brackets 2,v 2. The pivotable arm carrying the pressure rollers and consisting of rail 1 and a bracket 13 may be retained in its operative position by a resilient band 14 engaging over a pin 15 or by any other suitable retaining device as known Vin the art which may be provided on the arm, for example, at the rear supporting bar 16. The pivotable bracket 13 may also serve as a supporting bracket 13 for supporting the rear top roller.

FIGURES 4 and 5 illustrate a modication of the toproller supporting arm which permits the rollers to be dis* posed at a very close distance from each other. A rail 22 or 22 which is secured to a U-shaped arm 21 carries the top-roller supporting brackets 24 and 24 which consist of plastic, for example, nylon, or any other suitable elastic material and are secured to rail 22 or 22 by rivets 23 or by screws. The thickness of the material of brackets 24 and 24 is reduced at the points 241 and 241 so as to be able to bend like hinges at these points. Spring 25 presses the brackets 24 and 24 downwardly so that the top rollers will be loaded.

Supporting bracket 27 `-is slidably adjustable on arm 21 in a similar manner as in FIGURE 1 and provided with a load-transmitting yoke and loading springs. There is no necessity for specially guiding the top rollers in the brackets 24 and 24 if the shafts of the rollers are tightly fitting into the bearing parts 242 and 242 of brackets 24 and 24'. When the pressure rollers are being inserted, the lateral arms 243 and 243 will bend elastically in the outward direction and will thereafter again assume the position as shown in FIGURE 4.

FIGURE 6 shows a further modification of the supporting arm in which the compression springs as provided in the first two embodiments are replaced by draw springs 33 which are 4attached to supporting bracket 32 and to a vbridge member 31 serving as a load-transmitting` element.

Although 'our invention has been illustrated and described with reference to the preferred embodiments thereof, it is to be understood that it is in no way limited tothedetails of suchembodiments, Vbut is capableof nu. merous. modifications within the scope. of .the .appended claims. v' Y invention we claim is: v

- 1. In a drawing mechanism for spinning machines having top and bottom rollers, a pivotal loading arm above said top rollers, means for rotatably mounting said .top rollers on said arm and for slidably adjusting at least one of said top rollers along said arm, and loading means for pressing said top rollers toward said bottom rollers comprising springs mounted at least at one side laterally ofthe shaft of each of said top rollers, and extending substantially -within an area delimited on top and bottom byplanes running parallel to the drafting plane and touch ing the surface ofthe top rollers on the top and bottom thereof..-

2;` A drawing mechanism as defined in claim 1, in which said loading springsrare compression springs.. 3. A drawing mechanism as dened in claim 1, i

having thus been fully disclosed, what owhich. saidloading springs are draw springs.

'4. A drawing. mechanism as deiined in claim l, in which said loading springs are coil springs,

y.f f 5. A drawing mechanism as dened in claim 1, in .which said'floading means further comprise load-transl.mitting yokes acted upon by said springs to act upon the shafts of said top rollers.

6; A drawing mechanism as defined in claim 5, in which .said Vload-transmitting yokes also form brackets for supporting said top rollers.

7. A drawing mechanism as defined in claim 6, wherein fsa-id pivotable supportV arm includes a pivotable support 4which is formed by'one of said brackets.

8. A drawing mechanism as defined in claim 6, in which said brackets consist of a resilient plastic.

9. A drawing mechanism as dened in claim 6, in fwhich the material of said brackets is reduced in thickness at one particular point so as to be elastically bendjable at said point like a hinge.

10. In a drawing mechanism for spinning machines havingtop and bottom rollers, a pivotable loading arm labofve said top rollers, means for rotatably mounting said top rollers on said arm and` for slidablyadjusting at least one of said top rollers along said arm, loading means for pressing said top rollers toward said bottom rollers comprising springs mounted at least at one side laterally of the shaft of each of said top'rc'nllers andlextendingvbelow the shafts of said top rollers approximately to thedrafting plane and load-transmitting yokes acted upon by said springs to act upon the shafts of said top rollers, said loadtransmitting yokes forming brackets for supporting said top rollers, a member covering said loading arm and slidable thereon in thelongitudinal direction, and a set screw for adjusting at least one of said brackets with a top roller thereon in the longitudinal direction of said arm, said covering member when shifted in one direction covering said set screw and when shifted in the other direction extending said loading arm to permit the latter to be more easily raised and lowered relative to said bottom rollers. 11. In a drawing mechanism for spinning machines 'having top and bottom rollers and shafts therefor, a supporting means for said top rollers including a pivotal sup'- porting arm and brackets attached to said'supporting arm, said brackets having supported therein Vthe shafts of said top rollers, the top rollers being supported by said brackets adjacent said arm, said brackets being adjustable-in the longtiudinal direction of thesupporting arm, loading means for pressing said top rollers toward said bottom rollers compris-ing load-transmitting yokes mounted within said brackets and acting against said top roller shaft and springs mounted between said brackets and said yokes, said springs being mounted on at least one side of the shaft of each of said top rollers and having a sub`- stantial portion thereof extending below the axis of rotation of said top rollers 'and approximately tothe draftving plane, whereby the height of the supporting arm'is reduced andv greater stability thereof is provided. f

References Cited the file of this patent UNITED STATES PATENTS R-aible et al. 1 Apr. 20, 1954 

1. IN A DRAWING MECHANISM FOR SPINNING MACHINES HAVING TOP AND BOTTOM ROLLERS, A PIVOTAL LOADING ARM ABOVE SAID TOP ROLLERS, MEANS FOR ROTATABLY MOUNTING SAID TOP ROLLERS ON SAID ARM AND FOR SLIDABLY ADJUSTING AT LEAST ONE OF SAID TOP ROLLERS ALONG SAID ARM, AND LOADING MEANS FOR PRESSING SAID TOP ROLLERS TOWARD SAID BOTTOM ROLLERS COMPRISING SPRINGS MOUNTED AT LEAST AT ONE SIDE LATERALLY OF THE SHAFT OF EACH OF SAID TOP ROLLERS, AND EXTENDING SUBSTANTIALLY WITHIN AN AREA DELIMITED ON TOP AND BOTTOM BY PLANES RUNNING PARALLEL TO THE DRAFTING PLANE AND TOUCHING THE SURFACE OF THE TOP ROLLERS ON THE TOP AND BOTTOM THEREOF. 